Goalkeeper Kai McKenzie-Lyle has become the latest to sign for rapidly-improving Folkestone. Invicta boss Andy Drury had highlighted bringing in competition for No.1 Joe Coleman as an area where he wanted to improve his new-look Isthmian Premier squad. And the arrival of Guyana international McKenzie-Lyle, 27, who spent last season with National League South side Welling, is a timely boost for Folkestone after Coleman sustained a dead leg in Saturday’s impressive 2-1 victory at high-fliers Billericay. Drury, who has also signed defender Michael Kedman and brought him off the substitutes’ bench…